US20180288301A1 - Image Sensing Device and Sensing Method Using the Same - Google Patents
Image Sensing Device and Sensing Method Using the Same Download PDFInfo
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- US20180288301A1 US20180288301A1 US15/884,390 US201815884390A US2018288301A1 US 20180288301 A1 US20180288301 A1 US 20180288301A1 US 201815884390 A US201815884390 A US 201815884390A US 2018288301 A1 US2018288301 A1 US 2018288301A1
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- 238000000034 method Methods 0.000 title claims description 16
- 238000009826 distribution Methods 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 13
- 238000009828 non-uniform distribution Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 14
- 230000003287 optical effect Effects 0.000 description 6
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- H04N5/2353—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G06K9/00013—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H04N5/2351—
Definitions
- the present invention relates to an image sensing device and sensing method, and more particularly, to an image sensing device and sensing method capable of adjusting a length of exposure period of each of sensing units to improve resolution of an image.
- image sensing devices are utilized in many kinds of electronic devices, for example, digital camera, optical fingerprint recognition system and so on, wherein the optical fingerprint recognition system has been widely utilized.
- the lengths of exposure periods of all sensing units are the same.
- the intensities of the sensed light are different, which causes the problem of uneven brightness of the sensed image, affects the image quality, further increases complexity of image processing and decreases accuracy rate of fingerprint recognition. Accordingly, how to provide an image sensing device for optical fingerprint recognition to avoid the problems stated above has been one of the major objectives in the related industry.
- the present invention provides an image sensing device, comprising a sensing module, comprising a plurality of sensing units, for generating a plurality of first sensing signals and a plurality of second sensing signals; and a plurality of control units, respectively corresponding to the plurality of sensing units, for exposing the plurality of sensing units based on a first exposure period to generate the plurality of first sensing signals, and determining a plurality of second exposure periods for the corresponding sensing units according to the plurality of first sensing signals, and exposing the plurality of sensing units based on the plurality of second exposure periods to generate the plurality of second sensing signals; wherein the plurality of first sensing signals and the plurality of second sensing signals are generated at different times.
- the present invention further provides a sensing method for an image sensing device comprising a sensing module comprising a plurality of sensing units and a plurality of control units respectively corresponding to the sensing units, a control bus coupled to the sensing module and a signal processing circuit coupled to the control bus, the sensing method comprising using the control units for exposing the corresponding sensing units based on a first exposure period to generate a plurality of first sensing signal; using the control units for determining a plurality of second exposure periods corresponding to the sensing units according to the first sensing signals; using the control units for exposing the corresponding sensing units based on the second exposure periods to generate a plurality of second sensing signals; and using the control bus for transmitting the second sensing signals to the signal processing circuit to generate an image.
- FIG. 1A is a schematic diagram of a fingerprint recognition system according to an embodiment of the present invention.
- FIG. 1B is a schematic diagram of another fingerprint recognition system according to another embodiment of the present invention.
- FIG. 2 is a schematic diagram of an image sensing device according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of another image sensing device according to another embodiment of the present invention.
- FIG. 4 is a schematic diagram showing different sensing units with different exposure periods according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram showing a Gaussian distribution of intensity of light field.
- FIG. 6 is a schematic diagram showing a non-uniform distribution of intensity of light field.
- FIG. 7 is a schematic diagram of a sensing flowchart according to an embodiment of the present invention.
- FIG. 1A is a schematic diagram of a fingerprint recognition system 1 according to an embodiment of the present invention.
- the fingerprint recognition system 1 utilizes an image sensing device 10 for sensing fingerprint of a finger for fingerprint recognition.
- the image sensing device 10 includes a sensing module 102 , a light source L and a panel P.
- a light-emitting diode (LED) light source emits light to the surface of the finger, and the light is reflected from the finger and transmitted to the sensing module 102 .
- the sensing module 102 receives and senses the reflected light to generate a plurality of sensing signals.
- FIG. 1A is a schematic diagram of a fingerprint recognition system 1 according to an embodiment of the present invention.
- the fingerprint recognition system 1 utilizes an image sensing device 10 for sensing fingerprint of a finger for fingerprint recognition.
- the image sensing device 10 includes a sensing module 102 , a light source L and a panel P.
- the panel P in FIG. 1B comprises an organic light-emitting diode (OLED) display, and the OLED display is utilized to be a light source for emitting light to the surface of a finger, and the light is reflected by the finger and then transmitted to the sensing module 102 . Then, the sensing module 102 receives and senses the reflected light to generate a plurality of sensing signals.
- OLED organic light-emitting diode
- FIG. 2 is a schematic diagram of an image sensing device 10 according to an embodiment of the present invention.
- the image sensing device 10 is utilized for generating and processing the sensing signals to generate a sensing image.
- the image sensing device 10 further includes a control bus 104 and a signal processing circuit 106 .
- the sensing module 102 may be implemented by a pixel matrix, e.g. a structure of pin hole pixel array.
- the sensing module 102 comprises a plurality of sensing units 108 and a plurality of control units 110 .
- each of the sensing units 108 is a pixel of the pixel matrix, wherein each of the sensing units 108 is utilized for generating a first sensing signal and a second sensing signal, and each of the control units 110 respectively corresponds to one sensing unit 108 .
- each of the control units 110 respectively turns on and exposes the corresponding sensing unit 108 to the reflected light for a predetermined first exposure period so as to generate a first sensing signal.
- the control unit 110 determines a second exposure period for its corresponding sensing unit 108 according to the first sensing signal generated by the sensing unit 108 , and exposes the sensing unit 108 to the reflected light for the second exposure period, so as to generate a second sensing signal.
- the control bus 104 is coupled to the sensing module 102 , for receiving the second sensing signals generated by the sensing units 108 of the sensing module 102 .
- the signal processing circuit 106 is coupled to the control bus 104 for receiving the second sensing signals from the control bus 104 to generate a fingerprint image accordingly. Therefore, the image sensing device 10 utilizes each of the control units 110 to respectively control the exposure period for its corresponding sensing unit 108 , so as to improve quality of the sensed image and increase the image resolution.
- the image sensing device of the present invention utilizes each of the control unit 110 for controlling the exposure period of the corresponding sensing unit 108 , so as to turn on and expose the sensing units 108 to the reflected light for different lengths of exposure periods, rather than exposing all the sensing units 108 for the same length of exposure period, and improves the quality of the sensing signals and the resolution of the sensed image.
- one single control unit 110 may not only control one single corresponding sensing unit 108 , but also simultaneously control several corresponding sensing units 108 , or the control units 110 may be implemented by software setting or circuit controllers of hardware and so on, to improve the resolution of the sensed image.
- FIG. 3 is a schematic diagram of another image sensing device 30 according to an embodiment of the present invention.
- each of the control units 110 of the image sensing device 30 in FIG. 3 corresponds to four sensing units 108 .
- each of the control units 110 may simultaneously or respectively control the four sensing units 108 to be exposed to the reflected light for the same second exposure period or different second exposure periods.
- the first sensing signal and the second sensing signal of each sensing unit 108 are generated at different times.
- the control unit 110 determines the second exposure period of the corresponding sensing unit 108 according to a light sensing value (i.e. brightness) of the first sensing signal.
- a light sensing value i.e. brightness
- control unit 110 may be a switch to turn on or off the corresponding sensing unit 108 , so as to adjust the length of the exposure period of the corresponding sensing unit 108 , but is not limited thereto. That is, in one embodiment, each of the control units 110 is coupled to one corresponding sensing unit 108 (as shown in FIG. 2 ), and each of the control units 110 respectively determines and adjusts the second exposure period of its corresponding sensing unit 108 according to the first sensing signal generated by such sensing unit 108 . In another embodiment, each of the control units 110 is coupled to several sensing units 108 (as shown in FIG.
- each of the control units 110 simultaneously or respectively determines and adjusts one or more second exposure periods of the corresponding sensing units 108 according to the first sensing signals generated by such sensing units 108 . Since the light sensing values (i.e. values of brightness) of the first sensing signals generated by the sensing units 108 are different, the second exposure periods for such sensing units 108 will be determined to be different accordingly. Therefore, by determining and adjusting the second exposure periods of the sensing units 108 through their corresponding control units 110 , the image sensing device 30 may control and adjust the second exposure periods of the sensing units 108 so as to expose the sensing units 108 to the reflected light for different periods of time according to the different intensities of light fields where the sensing units 108 are located. In consequence, the resolution of the sensed image will be improved.
- the light sensing values i.e. values of brightness
- control unit 110 determines the second exposure period for its corresponding sensing unit 108 according to the light sensing value (i.e. brightness) of the first sensing signal generated by such sensing unit 108 .
- the sensing unit 108 will sense more light in the first exposure period than other sensing units 108 which are located in the light fields with lower intensities (i.e. the light sensing value of the first sensing signal generated by the sensing unit 108 is higher than those generated by such other sensing units 108 ).
- the control unit 110 After the control unit 110 determines the corresponding second exposure period, the control unit 110 properly turns on and off the corresponding sensing unit 108 , so as to decrease the second exposure period corresponding to the sensing unit 108 . In contrast, when the intensity of the light field in which the sensing unit 108 is located is low, the sensing unit 108 will sense less light in the first exposure period (i.e. the light sensing value of the first sensing signal generated by the sensing unit 108 is low). After the control unit 110 determines the corresponding second exposure period, the control unit 110 properly turns on and off the corresponding sensing unit 108 , so as to increase the second exposure period corresponding to the sensing unit 108 .
- FIG. 4 is a schematic diagram of different sensing units 108 with different exposure periods according to an embodiment of the present invention.
- the sensing units 108 _ 1 , 108 _ 2 , 108 _ 3 respectively correspond to exposure periods t 1 , t 2 , t 3 . That is, the exposure period t 1 of the sensing unit 108 _ 1 , the exposure period t 2 of the sensing unit 108 _ 2 and the exposure period t 3 of the sensing unit 108 _ 3 are not the same.
- the control unit 110 may control a pixel clock to manage the exposure period of the sensing unit 108 , i.e.
- the invention is not limited thereto. Therefore, when the light intensities sensed by the sensing units 108 of the sensing module 102 form a Gaussian distribution as shown in FIG. 5 or a non-uniform distribution as shown in FIG.
- the present invention may utilize the control units 110 to determine the second exposure periods corresponding to the sensing units 108 according to the first sensing signals, and turn on and off the corresponding sensing units 108 according to the second exposure periods, so as to control the second exposure periods of the corresponding sensing units 108 , such that the light sensing values of the second sensing signals generated by the sensing units 108 may form a uniform distribution of light field as shown in FIG. 6 .
- FIG. 7 is a schematic diagram of the sensing flowchart 70 according to an embodiment of the present invention.
- the sensing flowchart 70 includes the following steps:
- Step 702 Start.
- Step 704 The control units 110 expose the corresponding sensing units 108 to the reflected light for the first exposure period so as to generate a first sensing signal. All of the sensing units 108 share the same first exposure period.
- Step 706 The control units 110 determine the second exposure periods corresponding to the sensing units 108 according to the light sensing values of the first sensing signals generated by the sensing units 108 .
- Step 708 The control units 110 expose the sensing units 108 to the reflected light for the determined second exposure periods so as to generate the second sensing signals.
- Step 710 The control bus 104 transmits the second sensing signals to the signal processing circuit 106 so as to generate the image.
- Step 712 End.
- the image sensing device 30 of the present invention utilizes the control units 110 to properly turn on or off the corresponding sensing units 108 , so as to adjust the second exposure periods.
- the control unit 110 exposes the corresponding sensing unit 108 to the reflected light based on the predetermined first exposure period so as to generate the first sensing signal. All of the sensing units 108 share the same first exposure period.
- the control unit 110 determines the second exposure period of the corresponding sensing unit 108 according to the light sensing value of the first sensing signal. For example, when the distribution of light field represented by the first sensing signals (i.e.
- the control units 110 determine the second exposure periods of the sensing units 108 according to the light sensing values of the first sensing signals, which reflect the intensities of light fields in which the sensing units 108 are located, and turn on and off the corresponding sensing units 108 to accordingly adjust the second exposure periods corresponding to the sensing units 108 .
- the control units 110 expose the sensing units 108 based on the determined second exposure periods so as to generate the second sensing signals.
- the control bus 104 transmits the generated second sensing signals to the signal processing circuit 106 so as to generate the image.
- control unit 110 is corresponding to a single sensing unit 108 .
- one control unit 110 is connected to and controls several sensing units 108 , and the control unit 110 may properly turn on and off one or more sensing units 108 based on the second exposure period of each sensing unit 108 to adjust the length of exposure period of each of the one or more sensing units 108 , and the details of such embodiment are not narrated herein for brevity.
- each of the sensing units 108 is exposed to the reflected light twice so as to generate the first sensing signal and the second sensing signal. More specifically, the first sensing signal, which is generated when the sensing unit 108 is first turned on to sense the reflected light, is utilized for determining the intensity of the light field where the sensing unit 108 is located so as to adjust and set the second exposure period accordingly. When the sensing unit 108 is turned on at the second time, the sensing unit 108 is exposed to the reflected light for the second exposure period so as to generate the second sensing signal. The second sensing signal is then transmitted to the signal processing circuit 106 for generating a fingerprint image.
- the image sensing device Since the intensity distribution of light field is varied with time, each time before performing fingerprint recognition, the image sensing device needs to detect the intensity distribution of light field and the control units 110 have to determine the second exposure periods of the sensing units 108 . That is, when performing fingerprint recognition, the image sensing device 30 turns on all of the sensing units 108 for the predetermined first exposure period in order to sense the intensity distribution of light field, e.g. to turn on all of the sensing units 108 for the predetermined first exposure period of 10 ms.
- each of the control units 110 determines the intensity of light field in which the corresponding sensing unit 108 is located according to the light sensing value of the first sensing signal generated by the corresponding sensing unit 108 , and determines the second exposure period of such sensing unit 108 accordingly. Note that, since a distance and a relative position between each of the sensing units 108 and the light source L or the panel P are not the same, the sensed light intensity and the light sensing value of the first sensing signal generated by each of the sensing units 108 are different from each other.
- each of the control units 110 determines the second exposure period of its corresponding sensing unit 108 , and the control unit 110 exposes the corresponding sensing unit 108 to the reflected light for the determined second exposure period to generate the second sensing signal.
- the control bus 104 transmits the second sensing signals generated by the sensing units 108 to the signal processing circuit 106 to generate the fingerprint image.
- each of the control units 110 of the image sensing device may be coupled or corresponding to several sensing units 108 , so as to simultaneously or individually control the exposure period (s) of one or more sensing units 108 .
- the image sensing device of the present invention may determine the exposure period(s) of one or more sensing units 108 according to the intensity distribution of light field within a specific region where such sensing units 108 are located or the light sensing values corresponding to such sensing units 108 , or adjust the exposure period(s) of one or more sensing units 108 according to system and hardware requirements so as to effectively improve the quality and resolution of the sensed image.
- control units of the image sensing device may not only be implemented by circuit controllers of hardware, but also implemented by setting programmable software.
- the control units of the image sensing device may not only control the exposure period(s) for one or more sensing units, but also control the exposure period for a combination or group of several sensing units or a specific region where several sensing units are located, so as to meet various requirements of users and manufacturers.
- the embodiments mentioned above may be properly modified, and all belong to the scope of the present invention.
- the present invention provides an image sensing device and sensing method thereof for a fingerprint recognition system, more particularly, an optical fingerprint sensor of a fingerprint recognition system, which utilizes control units to control exposure periods of sensing units, so as to reduce impacts caused by non-uniform or uneven intensity distribution of light field, improve the quality of the sensed image, and increase the resolution of the fingerprint image, increasing the accuracy rate of fingerprint recognition.
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Abstract
Description
- This application claims the benefit of U.S. Provisional Application No. 62/479,269, filed on Mar. 30, 2017, which is incorporated herein by reference.
- The present invention relates to an image sensing device and sensing method, and more particularly, to an image sensing device and sensing method capable of adjusting a length of exposure period of each of sensing units to improve resolution of an image.
- With the advance and development of technology, image sensing devices are utilized in many kinds of electronic devices, for example, digital camera, optical fingerprint recognition system and so on, wherein the optical fingerprint recognition system has been widely utilized. In the conventional technology, the lengths of exposure periods of all sensing units are the same. However, since the distribution of light field intensity is uneven and the intensities of light fields in which the sensing units of the image sensing device of the optical fingerprint recognition system are located are different, the intensities of the sensed light are different, which causes the problem of uneven brightness of the sensed image, affects the image quality, further increases complexity of image processing and decreases accuracy rate of fingerprint recognition. Accordingly, how to provide an image sensing device for optical fingerprint recognition to avoid the problems stated above has been one of the major objectives in the related industry.
- It is therefore an object of the present invention to provide an image sensing device and sensing method for optical fingerprint recognition which is capable of adjusting lengths of exposure periods of sensing units to improve quality of an image and further increase accuracy rate of fingerprint recognition.
- The present invention provides an image sensing device, comprising a sensing module, comprising a plurality of sensing units, for generating a plurality of first sensing signals and a plurality of second sensing signals; and a plurality of control units, respectively corresponding to the plurality of sensing units, for exposing the plurality of sensing units based on a first exposure period to generate the plurality of first sensing signals, and determining a plurality of second exposure periods for the corresponding sensing units according to the plurality of first sensing signals, and exposing the plurality of sensing units based on the plurality of second exposure periods to generate the plurality of second sensing signals; wherein the plurality of first sensing signals and the plurality of second sensing signals are generated at different times.
- The present invention further provides a sensing method for an image sensing device comprising a sensing module comprising a plurality of sensing units and a plurality of control units respectively corresponding to the sensing units, a control bus coupled to the sensing module and a signal processing circuit coupled to the control bus, the sensing method comprising using the control units for exposing the corresponding sensing units based on a first exposure period to generate a plurality of first sensing signal; using the control units for determining a plurality of second exposure periods corresponding to the sensing units according to the first sensing signals; using the control units for exposing the corresponding sensing units based on the second exposure periods to generate a plurality of second sensing signals; and using the control bus for transmitting the second sensing signals to the signal processing circuit to generate an image.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
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FIG. 1A is a schematic diagram of a fingerprint recognition system according to an embodiment of the present invention. -
FIG. 1B is a schematic diagram of another fingerprint recognition system according to another embodiment of the present invention. -
FIG. 2 is a schematic diagram of an image sensing device according to an embodiment of the present invention. -
FIG. 3 is a schematic diagram of another image sensing device according to another embodiment of the present invention. -
FIG. 4 is a schematic diagram showing different sensing units with different exposure periods according to an embodiment of the present invention. -
FIG. 5 is a schematic diagram showing a Gaussian distribution of intensity of light field. -
FIG. 6 is a schematic diagram showing a non-uniform distribution of intensity of light field. -
FIG. 7 is a schematic diagram of a sensing flowchart according to an embodiment of the present invention. - Please refer to
FIG. 1A , which is a schematic diagram of a fingerprint recognition system 1 according to an embodiment of the present invention. The fingerprint recognition system 1 utilizes animage sensing device 10 for sensing fingerprint of a finger for fingerprint recognition. Theimage sensing device 10 includes asensing module 102, a light source L and a panel P. For example, in an embodiment, when a finger of a user places on the fingerprint recognition system 1, a light-emitting diode (LED) light source emits light to the surface of the finger, and the light is reflected from the finger and transmitted to thesensing module 102. Next, thesensing module 102 receives and senses the reflected light to generate a plurality of sensing signals. Or, in another embodiment, please refer toFIG. 1B , which is a schematic diagram of anotherfingerprint recognition system 2 according to an embodiment of the present invention. Different from the fingerprint recognition system 1 ofFIG. 1A , the panel P inFIG. 1B comprises an organic light-emitting diode (OLED) display, and the OLED display is utilized to be a light source for emitting light to the surface of a finger, and the light is reflected by the finger and then transmitted to thesensing module 102. Then, thesensing module 102 receives and senses the reflected light to generate a plurality of sensing signals. - In detail, please continue to refer to
FIG. 2 , which is a schematic diagram of animage sensing device 10 according to an embodiment of the present invention. Theimage sensing device 10 is utilized for generating and processing the sensing signals to generate a sensing image. Theimage sensing device 10 further includes acontrol bus 104 and asignal processing circuit 106. Thesensing module 102 may be implemented by a pixel matrix, e.g. a structure of pin hole pixel array. In this embodiment, thesensing module 102 comprises a plurality ofsensing units 108 and a plurality ofcontrol units 110. For example, each of thesensing units 108 is a pixel of the pixel matrix, wherein each of thesensing units 108 is utilized for generating a first sensing signal and a second sensing signal, and each of thecontrol units 110 respectively corresponds to onesensing unit 108. For performing fingerprint recognition, each of thecontrol units 110 respectively turns on and exposes thecorresponding sensing unit 108 to the reflected light for a predetermined first exposure period so as to generate a first sensing signal. Then, thecontrol unit 110 determines a second exposure period for itscorresponding sensing unit 108 according to the first sensing signal generated by thesensing unit 108, and exposes thesensing unit 108 to the reflected light for the second exposure period, so as to generate a second sensing signal. Thecontrol bus 104 is coupled to thesensing module 102, for receiving the second sensing signals generated by thesensing units 108 of thesensing module 102. Thesignal processing circuit 106 is coupled to thecontrol bus 104 for receiving the second sensing signals from thecontrol bus 104 to generate a fingerprint image accordingly. Therefore, theimage sensing device 10 utilizes each of thecontrol units 110 to respectively control the exposure period for itscorresponding sensing unit 108, so as to improve quality of the sensed image and increase the image resolution. - The embodiments stated in the above are utilized for illustrating that the image sensing device of the present invention utilizes each of the
control unit 110 for controlling the exposure period of thecorresponding sensing unit 108, so as to turn on and expose thesensing units 108 to the reflected light for different lengths of exposure periods, rather than exposing all thesensing units 108 for the same length of exposure period, and improves the quality of the sensing signals and the resolution of the sensed image. Notably, the skilled person in the art may properly design the image sensing device according to various requirements of different systems; for example, onesingle control unit 110 may not only control one singlecorresponding sensing unit 108, but also simultaneously control severalcorresponding sensing units 108, or thecontrol units 110 may be implemented by software setting or circuit controllers of hardware and so on, to improve the resolution of the sensed image. - Please refer to
FIG. 3 , which is a schematic diagram of anotherimage sensing device 30 according to an embodiment of the present invention. Different fromFIG. 2 , each of thecontrol units 110 of theimage sensing device 30 inFIG. 3 corresponds to foursensing units 108. In other words, each of thecontrol units 110 may simultaneously or respectively control the foursensing units 108 to be exposed to the reflected light for the same second exposure period or different second exposure periods. In detail, the first sensing signal and the second sensing signal of eachsensing unit 108 are generated at different times. Thecontrol unit 110 determines the second exposure period of thecorresponding sensing unit 108 according to a light sensing value (i.e. brightness) of the first sensing signal. In this embodiment, thecontrol unit 110 may be a switch to turn on or off thecorresponding sensing unit 108, so as to adjust the length of the exposure period of thecorresponding sensing unit 108, but is not limited thereto. That is, in one embodiment, each of thecontrol units 110 is coupled to one corresponding sensing unit 108 (as shown inFIG. 2 ), and each of thecontrol units 110 respectively determines and adjusts the second exposure period of itscorresponding sensing unit 108 according to the first sensing signal generated bysuch sensing unit 108. In another embodiment, each of thecontrol units 110 is coupled to several sensing units 108 (as shown inFIG. 3 ), and each of thecontrol units 110 simultaneously or respectively determines and adjusts one or more second exposure periods of thecorresponding sensing units 108 according to the first sensing signals generated bysuch sensing units 108. Since the light sensing values (i.e. values of brightness) of the first sensing signals generated by thesensing units 108 are different, the second exposure periods forsuch sensing units 108 will be determined to be different accordingly. Therefore, by determining and adjusting the second exposure periods of thesensing units 108 through theircorresponding control units 110, theimage sensing device 30 may control and adjust the second exposure periods of thesensing units 108 so as to expose thesensing units 108 to the reflected light for different periods of time according to the different intensities of light fields where thesensing units 108 are located. In consequence, the resolution of the sensed image will be improved. - In detail, the
control unit 110 determines the second exposure period for itscorresponding sensing unit 108 according to the light sensing value (i.e. brightness) of the first sensing signal generated bysuch sensing unit 108. For example, when the intensity of the light field in which thesensing unit 108 is located is high, thesensing unit 108 will sense more light in the first exposure period thanother sensing units 108 which are located in the light fields with lower intensities (i.e. the light sensing value of the first sensing signal generated by thesensing unit 108 is higher than those generated by such other sensing units 108). After thecontrol unit 110 determines the corresponding second exposure period, thecontrol unit 110 properly turns on and off the correspondingsensing unit 108, so as to decrease the second exposure period corresponding to thesensing unit 108. In contrast, when the intensity of the light field in which thesensing unit 108 is located is low, thesensing unit 108 will sense less light in the first exposure period (i.e. the light sensing value of the first sensing signal generated by thesensing unit 108 is low). After thecontrol unit 110 determines the corresponding second exposure period, thecontrol unit 110 properly turns on and off the correspondingsensing unit 108, so as to increase the second exposure period corresponding to thesensing unit 108. - Please refer to
FIG. 4 , which is a schematic diagram ofdifferent sensing units 108 with different exposure periods according to an embodiment of the present invention. InFIG. 4 , the sensing units 108_1, 108_2, 108_3 respectively correspond to exposure periods t1, t2, t3. That is, the exposure period t1 of the sensing unit 108_1, the exposure period t2 of the sensing unit 108_2 and the exposure period t3 of the sensing unit 108_3 are not the same. Note that, thecontrol unit 110 may control a pixel clock to manage the exposure period of thesensing unit 108, i.e. to change or adjust the exposure period, or use any other control methods to control or adjust the exposure period of thesensing unit 108, but the invention is not limited thereto. Therefore, when the light intensities sensed by thesensing units 108 of thesensing module 102 form a Gaussian distribution as shown inFIG. 5 or a non-uniform distribution as shown inFIG. 6 , the present invention may utilize thecontrol units 110 to determine the second exposure periods corresponding to thesensing units 108 according to the first sensing signals, and turn on and off the correspondingsensing units 108 according to the second exposure periods, so as to control the second exposure periods of the correspondingsensing units 108, such that the light sensing values of the second sensing signals generated by thesensing units 108 may form a uniform distribution of light field as shown inFIG. 6 . - More specifically, the exposure control method applied to the
image sensing device 30 stated above may be summarized as asensing flowchart 70. Please refer toFIG. 7 , which is a schematic diagram of thesensing flowchart 70 according to an embodiment of the present invention. Thesensing flowchart 70 includes the following steps: - Step 702: Start.
- Step 704: The
control units 110 expose thecorresponding sensing units 108 to the reflected light for the first exposure period so as to generate a first sensing signal. All of thesensing units 108 share the same first exposure period. - Step 706: The
control units 110 determine the second exposure periods corresponding to thesensing units 108 according to the light sensing values of the first sensing signals generated by thesensing units 108. - Step 708: The
control units 110 expose thesensing units 108 to the reflected light for the determined second exposure periods so as to generate the second sensing signals. - Step 710: The
control bus 104 transmits the second sensing signals to thesignal processing circuit 106 so as to generate the image. - Step 712: End.
- According to the
sensing flowchart 70, theimage sensing device 30 of the present invention utilizes thecontrol units 110 to properly turn on or off the correspondingsensing units 108, so as to adjust the second exposure periods. In an embodiment, for each of thesensing units 108, according toStep 704, thecontrol unit 110 exposes the correspondingsensing unit 108 to the reflected light based on the predetermined first exposure period so as to generate the first sensing signal. All of thesensing units 108 share the same first exposure period. Next, inStep 706, thecontrol unit 110 determines the second exposure period of thecorresponding sensing unit 108 according to the light sensing value of the first sensing signal. For example, when the distribution of light field represented by the first sensing signals (i.e. the distribution represented by the light sensing values) is the Gaussian distribution as shown inFIG. 5 or the non-uniform distribution as shown inFIG. 6 , thecontrol units 110 determine the second exposure periods of thesensing units 108 according to the light sensing values of the first sensing signals, which reflect the intensities of light fields in which thesensing units 108 are located, and turn on and off the correspondingsensing units 108 to accordingly adjust the second exposure periods corresponding to thesensing units 108. InStep 708, thecontrol units 110 expose thesensing units 108 based on the determined second exposure periods so as to generate the second sensing signals. Finally, inStep 710, thecontrol bus 104 transmits the generated second sensing signals to thesignal processing circuit 106 so as to generate the image. Notably, the description mentioned above is for the embodiment where acontrol unit 110 is corresponding to asingle sensing unit 108. In another embodiment, onecontrol unit 110 is connected to and controls several sensingunits 108, and thecontrol unit 110 may properly turn on and off one ormore sensing units 108 based on the second exposure period of eachsensing unit 108 to adjust the length of exposure period of each of the one ormore sensing units 108, and the details of such embodiment are not narrated herein for brevity. - In the embodiments mentioned above, each of the
sensing units 108 is exposed to the reflected light twice so as to generate the first sensing signal and the second sensing signal. More specifically, the first sensing signal, which is generated when thesensing unit 108 is first turned on to sense the reflected light, is utilized for determining the intensity of the light field where thesensing unit 108 is located so as to adjust and set the second exposure period accordingly. When thesensing unit 108 is turned on at the second time, thesensing unit 108 is exposed to the reflected light for the second exposure period so as to generate the second sensing signal. The second sensing signal is then transmitted to thesignal processing circuit 106 for generating a fingerprint image. Since the intensity distribution of light field is varied with time, each time before performing fingerprint recognition, the image sensing device needs to detect the intensity distribution of light field and thecontrol units 110 have to determine the second exposure periods of thesensing units 108. That is, when performing fingerprint recognition, theimage sensing device 30 turns on all of thesensing units 108 for the predetermined first exposure period in order to sense the intensity distribution of light field, e.g. to turn on all of thesensing units 108 for the predetermined first exposure period of 10 ms. Next, each of thecontrol units 110 determines the intensity of light field in which the correspondingsensing unit 108 is located according to the light sensing value of the first sensing signal generated by the correspondingsensing unit 108, and determines the second exposure period ofsuch sensing unit 108 accordingly. Note that, since a distance and a relative position between each of thesensing units 108 and the light source L or the panel P are not the same, the sensed light intensity and the light sensing value of the first sensing signal generated by each of thesensing units 108 are different from each other. Then, each of thecontrol units 110 determines the second exposure period of itscorresponding sensing unit 108, and thecontrol unit 110 exposes the correspondingsensing unit 108 to the reflected light for the determined second exposure period to generate the second sensing signal. Finally, thecontrol bus 104 transmits the second sensing signals generated by thesensing units 108 to thesignal processing circuit 106 to generate the fingerprint image. - In addition, each of the
control units 110 of the image sensing device may be coupled or corresponding toseveral sensing units 108, so as to simultaneously or individually control the exposure period (s) of one ormore sensing units 108. In this embodiment, the image sensing device of the present invention may determine the exposure period(s) of one ormore sensing units 108 according to the intensity distribution of light field within a specific region wheresuch sensing units 108 are located or the light sensing values corresponding tosuch sensing units 108, or adjust the exposure period(s) of one ormore sensing units 108 according to system and hardware requirements so as to effectively improve the quality and resolution of the sensed image. - Note that, the embodiments stated above are utilized for illustrating the spirit of the present invention, within which those skilled people in the art may make various modifications and alternations, and the present invention is not limited thereto. For example, the control units of the image sensing device may not only be implemented by circuit controllers of hardware, but also implemented by setting programmable software. The control units of the image sensing device may not only control the exposure period(s) for one or more sensing units, but also control the exposure period for a combination or group of several sensing units or a specific region where several sensing units are located, so as to meet various requirements of users and manufacturers. The embodiments mentioned above may be properly modified, and all belong to the scope of the present invention.
- In summary, the present invention provides an image sensing device and sensing method thereof for a fingerprint recognition system, more particularly, an optical fingerprint sensor of a fingerprint recognition system, which utilizes control units to control exposure periods of sensing units, so as to reduce impacts caused by non-uniform or uneven intensity distribution of light field, improve the quality of the sensed image, and increase the resolution of the fingerprint image, increasing the accuracy rate of fingerprint recognition.
- Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20180343375A1 (en) * | 2017-05-23 | 2018-11-29 | Google Llc | Systems and Methods for Automatic Exposure in High Dynamic Range Video Capture Systems |
CN109564631A (en) * | 2018-11-14 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Optical finger print sensing device and method for sensing under a kind of screen |
CN110443204A (en) * | 2018-10-11 | 2019-11-12 | 神盾股份有限公司 | Luminous signal intensity control method and electronic device |
US20190371239A1 (en) * | 2018-05-31 | 2019-12-05 | Beijing Xiaomi Mobile Software Co., Ltd. | Terminal device, sensing method and apparatus |
US20200175248A1 (en) * | 2018-12-03 | 2020-06-04 | Novatek Microelectronics Corp. | Sensor Device and Flicker Noise Mitigating Method |
US20230215209A1 (en) * | 2021-12-31 | 2023-07-06 | Shenzhen GOODIX Technology Co., Ltd. | Method and apparatus for fingerprint identification, and electronic device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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Citations (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6292576B1 (en) * | 2000-02-29 | 2001-09-18 | Digital Persona, Inc. | Method and apparatus for distinguishing a human finger from a reproduction of a fingerprint |
US20050105785A1 (en) * | 2003-11-18 | 2005-05-19 | Canon Kabushiki Kaisha | Image pick-up apparatus, fingerprint certification apparatus and image pick-up method |
US7277163B2 (en) * | 2000-09-20 | 2007-10-02 | Hitachi, Ltd. | Personal identification system |
US7382931B2 (en) * | 2003-04-29 | 2008-06-03 | Microsoft Corporation | System and process for generating high dynamic range video |
US20080297597A1 (en) * | 2007-06-01 | 2008-12-04 | Keyence Corporation | Magnification Observation Apparatus and Method For Photographing Magnified Image |
US8385611B2 (en) * | 2006-03-27 | 2013-02-26 | Fujistu Limited | Fingerprint authentication device and information processing device with a sweep fingerprint sensor that acquires images of fingerprint at least two different sensitivity levels in single scan |
US20130070121A1 (en) * | 2009-10-28 | 2013-03-21 | Jinwei Gu | Methods and systems for coded rolling shutter |
US20130127714A1 (en) * | 2011-11-22 | 2013-05-23 | Pixart Imaging Inc. | User interface system and optical finger mouse system |
US20140022354A1 (en) * | 2011-03-31 | 2014-01-23 | Fujifilm Corporation | Solid-state imaging element, driving method thereof, and imaging device |
US20150244916A1 (en) * | 2014-02-21 | 2015-08-27 | Samsung Electronics Co., Ltd. | Electronic device and control method of the same |
US9711553B2 (en) * | 2014-04-28 | 2017-07-18 | Samsung Electronics Co., Ltd. | Image sensor including a pixel having photoelectric conversion elements and image processing device having the image sensor |
US20170300738A1 (en) * | 2015-12-31 | 2017-10-19 | Shenzhen GOODIX Technology Co., Ltd. | Fingerprint recognition method and fingerprint recognition apparatus |
US20170316195A1 (en) * | 2016-05-02 | 2017-11-02 | Safran Identity & Security | Device and method for optical capture at different wavelengths emitted sequentially |
US20180046837A1 (en) * | 2015-03-25 | 2018-02-15 | Apple Inc. | Electronic device including pin hole array mask above optical image sensor and related methods |
US20180080877A1 (en) * | 2015-03-17 | 2018-03-22 | Hamamatsu Photonics K.K. | Device for generating fluorescence image and method for generating fluorescence image |
US20180189540A1 (en) * | 2016-12-30 | 2018-07-05 | Eosmem Corporation | Exposure time determination method for image sensing operation |
US20180233531A1 (en) * | 2017-02-13 | 2018-08-16 | Egis Technology Inc. | Fingerprint Identification System, Sensing Method and Manufacturing Method |
US20190012517A1 (en) * | 2017-07-05 | 2019-01-10 | Shenzhen GOODIX Technology Co., Ltd. | Method and apparatus for acquiring fingerprint, chip and terminal device |
US20190122025A1 (en) * | 2017-10-20 | 2019-04-25 | Synaptics Incorporated | Optical biometric sensor with automatic gain and exposure control |
US10318791B2 (en) * | 2017-07-18 | 2019-06-11 | Shenzhen GOODIX Technology Co., Ltd. | Anti-spoofing sensing for rejecting fake fingerprint patterns in under-screen optical sensor module for on-screen fingerprint sensing |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013066142A (en) | 2011-08-31 | 2013-04-11 | Sony Corp | Image processing apparatus, image processing method, and program |
CN105763816B (en) | 2016-01-31 | 2019-01-08 | 天津大学 | It is a kind of based on the high speed, high resolution imaging method for encoding exposure pixel-by-pixel |
-
2018
- 2018-01-31 US US15/884,390 patent/US10645302B2/en not_active Expired - Fee Related
Patent Citations (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6292576B1 (en) * | 2000-02-29 | 2001-09-18 | Digital Persona, Inc. | Method and apparatus for distinguishing a human finger from a reproduction of a fingerprint |
US7277163B2 (en) * | 2000-09-20 | 2007-10-02 | Hitachi, Ltd. | Personal identification system |
US7382931B2 (en) * | 2003-04-29 | 2008-06-03 | Microsoft Corporation | System and process for generating high dynamic range video |
US20050105785A1 (en) * | 2003-11-18 | 2005-05-19 | Canon Kabushiki Kaisha | Image pick-up apparatus, fingerprint certification apparatus and image pick-up method |
US8385611B2 (en) * | 2006-03-27 | 2013-02-26 | Fujistu Limited | Fingerprint authentication device and information processing device with a sweep fingerprint sensor that acquires images of fingerprint at least two different sensitivity levels in single scan |
US20080297597A1 (en) * | 2007-06-01 | 2008-12-04 | Keyence Corporation | Magnification Observation Apparatus and Method For Photographing Magnified Image |
US20130070121A1 (en) * | 2009-10-28 | 2013-03-21 | Jinwei Gu | Methods and systems for coded rolling shutter |
US20140022354A1 (en) * | 2011-03-31 | 2014-01-23 | Fujifilm Corporation | Solid-state imaging element, driving method thereof, and imaging device |
US9433382B2 (en) * | 2011-11-22 | 2016-09-06 | Pixart Imaging Inc | User interface system and optical finger mouse system |
US20130127714A1 (en) * | 2011-11-22 | 2013-05-23 | Pixart Imaging Inc. | User interface system and optical finger mouse system |
US20150244916A1 (en) * | 2014-02-21 | 2015-08-27 | Samsung Electronics Co., Ltd. | Electronic device and control method of the same |
US9711553B2 (en) * | 2014-04-28 | 2017-07-18 | Samsung Electronics Co., Ltd. | Image sensor including a pixel having photoelectric conversion elements and image processing device having the image sensor |
US20180080877A1 (en) * | 2015-03-17 | 2018-03-22 | Hamamatsu Photonics K.K. | Device for generating fluorescence image and method for generating fluorescence image |
US20180046837A1 (en) * | 2015-03-25 | 2018-02-15 | Apple Inc. | Electronic device including pin hole array mask above optical image sensor and related methods |
US20170300738A1 (en) * | 2015-12-31 | 2017-10-19 | Shenzhen GOODIX Technology Co., Ltd. | Fingerprint recognition method and fingerprint recognition apparatus |
US20170316195A1 (en) * | 2016-05-02 | 2017-11-02 | Safran Identity & Security | Device and method for optical capture at different wavelengths emitted sequentially |
US20180189540A1 (en) * | 2016-12-30 | 2018-07-05 | Eosmem Corporation | Exposure time determination method for image sensing operation |
US20180233531A1 (en) * | 2017-02-13 | 2018-08-16 | Egis Technology Inc. | Fingerprint Identification System, Sensing Method and Manufacturing Method |
US10388689B2 (en) * | 2017-02-13 | 2019-08-20 | Egis Technology Inc. | Fingerprint identification system, sensing method and manufacturing method |
US20190012517A1 (en) * | 2017-07-05 | 2019-01-10 | Shenzhen GOODIX Technology Co., Ltd. | Method and apparatus for acquiring fingerprint, chip and terminal device |
US10318791B2 (en) * | 2017-07-18 | 2019-06-11 | Shenzhen GOODIX Technology Co., Ltd. | Anti-spoofing sensing for rejecting fake fingerprint patterns in under-screen optical sensor module for on-screen fingerprint sensing |
US20190122025A1 (en) * | 2017-10-20 | 2019-04-25 | Synaptics Incorporated | Optical biometric sensor with automatic gain and exposure control |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10911674B2 (en) | 2017-05-23 | 2021-02-02 | Google Llc | Systems and methods for selectively activating high dynamic range in a video capture system |
US11050936B2 (en) | 2017-05-23 | 2021-06-29 | Google Llc | Systems and methods for automatic exposure in high dynamic range video capture systems |
US11902657B2 (en) | 2017-05-23 | 2024-02-13 | Google Llc | Systems and methods for automatic exposure in high dynamic range video capture systems |
US11595579B2 (en) | 2017-05-23 | 2023-02-28 | Google Llc | Systems and methods for automatic exposure in high dynamic range video capture systems |
US20180343375A1 (en) * | 2017-05-23 | 2018-11-29 | Google Llc | Systems and Methods for Automatic Exposure in High Dynamic Range Video Capture Systems |
US10630901B2 (en) | 2017-05-23 | 2020-04-21 | Google Llc | Systems and methods for selectively activating high dynamic range in a video capture system |
US11297234B2 (en) | 2017-05-23 | 2022-04-05 | Google Llc | Systems and methods for automatic exposure in high dynamic range video capture systems |
US10560629B2 (en) * | 2017-05-23 | 2020-02-11 | Google Llc | Systems and methods for automatic exposure in high dynamic range video capture systems |
US10957250B2 (en) * | 2018-05-31 | 2021-03-23 | Beijing Xiaomi Mobile Software Co., Ltd. | Terminal device, sensing method and apparatus with sensor for fingerprint identification |
US20190371239A1 (en) * | 2018-05-31 | 2019-12-05 | Beijing Xiaomi Mobile Software Co., Ltd. | Terminal device, sensing method and apparatus |
CN110443204A (en) * | 2018-10-11 | 2019-11-12 | 神盾股份有限公司 | Luminous signal intensity control method and electronic device |
CN109564631A (en) * | 2018-11-14 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Optical finger print sensing device and method for sensing under a kind of screen |
US20200175248A1 (en) * | 2018-12-03 | 2020-06-04 | Novatek Microelectronics Corp. | Sensor Device and Flicker Noise Mitigating Method |
US10755065B2 (en) * | 2018-12-03 | 2020-08-25 | Novatek Microelectronics Corp. | Sensor device and flicker noise mitigating method |
US20230215209A1 (en) * | 2021-12-31 | 2023-07-06 | Shenzhen GOODIX Technology Co., Ltd. | Method and apparatus for fingerprint identification, and electronic device |
US12002281B2 (en) * | 2021-12-31 | 2024-06-04 | Shenzhen GOODIX Technology Co., Ltd. | Method and apparatus for fingerprint identification, and electronic device |
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